Apparatus for removing fine material from a liquid

Abstract

An apparatus serves for removing fine material to be screened from waste water. The apparatus includes a sieve grate ( 6 ) and a detaching device ( 16 ). The sieve grate ( 6 ) is cylindrical, and it is rotatingly driven. The sieve grate ( 6 ) allows for waste water to flow from its interior towards its exterior. The sieve grate ( 6 ) includes a supporting body ( 13 ) and a mesh sieve ( 7 ). The supporting body ( 13 ) is located at the exterior of the sieve grate ( 6 ). The supporting body ( 13 ) is made of a perforated sheet metal including comparatively large openings ( 37 ). The supporting body ( 13 ) provides for resistance and stability of the sieve grate ( 6 ). The mesh sieve ( 7 ) is located in the interior of the sieve grate ( 6 ). The mesh sieve ( 7 ) forms a separation surface ( 14 ) for the material to be screened. The mesh sieve ( 7 ) includes meshes of a comparatively small size. The mesh sieve ( 7 ) is fixedly connected to the supporting body ( 13 ). The detaching device ( 16 ) is arranged outside of the sieve grate ( 6 ). The detaching device ( 16 ) includes a plurality of nozzles ( 22 ). The nozzles ( 22 ) are designed and arranged to spray water from outside of the sieve grate ( 6 ) towards the interior of the sieve grate ( 6 ) in a way to detach material to be screened adhering to the inner surface of the sieve grate ( 6 ).

1. An apparatus for removing fine material to be screened from waste water, comprising:
 a sieve grate,
 said sieve grate being designed to be cylindrical, 
 said sieve grate having an inner surface, an interior and an exterior, 
 said sieve grate being designed and arranged to be rotatingly driven, 
 said sieve grate being designed and arranged such that waste water can flow from the interior towards the exterior of said sieve grate, 
 said sieve grate including a supporting body and a mesh sieve, 
 said supporting body being located at the exterior of said sieve grate, 
 said supporting body being made of a perforated sheet metal including comparatively large openings, 
 said supporting body being designed and arranged to provide resistance and stability to said sieve grate, 
 said mesh sieve being located in the interior of said sieve grate, 
 said mesh sieve being designed and arranged to form a separation surface, 
 said mesh sieve including meshes of a comparatively small size, and 
 said mesh sieve being fixedly connected to said supporting body; and 
 
 a detaching device,
 said detaching device being arranged outside of said sieve grate, 
 said detaching device including a plurality of nozzles, said nozzles being designed and arranged to spray water from outside of said sieve grate towards the interior of said sieve grate in a way to detach material to be screened adhering to the inner surface of said sieve grate. 
 
 
   
   
     2. The apparatus of  claim 1 , wherein said sieve grate substantially only consists of said supporting body and said mesh sieve. 
   
   
     3. The apparatus of  claim 1 , wherein said mesh sieve is fixedly connected to said supporting body at spaced apart points. 
   
   
     4. The apparatus of  claim 1 , wherein said mesh sieve is fixedly connected to said supporting body in spaced apart regions. 
   
   
     5. The apparatus of  claim 1 , wherein said supporting body includes comparatively large openings being surrounded by bars, said openings having a surface portion of approximately between 70% and 90% and said bars having a surface portion of approximately between 30% and 10%. 
   
   
     6. The apparatus of  claim 1 , wherein said openings of said supporting body have a rectangular shape. 
   
   
     7. The apparatus of  claim 1 , wherein said openings of said supporting body have a square shape. 
   
   
     8. The apparatus of  claim 1 , wherein said openings of said supporting body have a rounded shape. 
   
   
     9. The apparatus of  claim 1 , wherein said mesh sieve has a mesh size of approximately between 0.1 and 1.0 mm. 
   
   
     10. The apparatus of  claim 1 , wherein
 said sieve grate has an axis, said sieve grate being designed to be arranged in a channel through which waste water flows such that the axis is arranged at an inclined orientation in the channel, and 
 the apparatus further includes a feeding hopper and a screw conveyor unit including a driven conveyor screw, said screw conveyor unit leading to a discharge location located outside of the waste water, said feeding hopper being arranged in the region of said sieve grate, said feeding hopper being connected to said screw conveyor unit. 
 
   
   
     11. The apparatus of  claim 10 , wherein said sieve grate includes a plurality of scooping elements, said scooping elements being arranged at the inner surface of said sieve grate, said scooping elements being designed and arranged to convey the fine material to be screened in an upward direction. 
   
   
     12. The apparatus of  claim 11 , wherein said scooping elements include a plurality of slit-like openings. 
   
   
     13. The apparatus of  claim 10 , wherein said feeding hopper has a bottom, said bottom including a plurality of slits. 
   
   
     14. The apparatus of  claim 1 , wherein
 said sieve grate has an axis, said sieve grate being designed to be arranged such that the axis is arranged at a horizontal orientation, and 
 said sieve grate includes a guiding and conveying helix, said guiding and conveying helix being designed and arranged to convey the fine material to be screened in a horizontal direction. 
 
   
   
     15. The apparatus of  claim 1 , wherein said mesh sieve is connected to said supporting body by spot welding. 
   
   
     16. An apparatus for removing fine material to be screened from waste water, comprising:
 a sieve grate,
 said sieve grate being designed to be cylindrical. 
 said sieve grate having an Inner surface, an interior and an exterior, 
 said sieve grate being deigned and arranged to be rotatingly driven, 
 said sieve grate being designed and arranged such that waste water can flow from the Interior towards the exterior of said sieve grate, 
 said sieve grate Including a supporting body and a mesh sieve, 
 said supporting body being located at the exterior of said sieve grate, 
 said supporting body being made of a perforated sheet metal including comparatively large openings, 
 said supporting body being deigned and arranged to provide resistance and stability to said sieve grate, 
 said mesh sieve being located in the interior of said sieve grate, 
 said mesh sieve being designed and arranged to form a separation surface, said separation surface being designed and arranged to separate the material to be screened from the waste water in a way that the material to be screened sticks to the separation surface, 
 said mesh sieve including openings of a size of approximately between 0.1 and 1.0 mm, and 
 said mesh sieve being fixedly connected to said supporting body; and a detaching device, 
 said detaching device being arranged outside of said sieve grate, 
 said detaching device including a plurality of nozzles, said nozzles being designed and arranged to spray a cleaning medium from outside of said sieve grate towards the interior of said sieve grate in a way to detach material to be screened adhering to the inner surface of said sieve grate. 
 
 
   
   
     17. The apparatus of  claim 16 , wherein said sieve grate substantially only consists of said supporting body and said mesh sieve. 
   
   
     18. The apparatus of  claim 16 , wherein said mesh sieve is fixedly connected to said supporting body in a punctual way. 
   
   
     19. The apparatus of  claim 16 , wherein said mesh sieve is fixedly connected to said supporting body in regions. 
   
   
     20. The apparatus of  claim 16 , wherein said supporting body includes comparatively large openings being surrounded by bars, said openings having a surface portion of approximately between 70% and 90% and said bars having a surface portion of approximately between 30% and 10%.